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  1. #14
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Quote Originally Posted by jaredhamilton View Post
    Chris came today and observed the "fan not spinning" issue, and concluded there must be a problem with the brand-new low ambient control that he'd installed. So he took that offline for now, and is bringing a new one on Thursday.
    Hopefully some testing was done to verify that the fan should have been running under the conditions the system was operating in.
    If more government is the answer, then it's a really stupid question.

  2. #15
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,913
    Chris came by again today, and said we have a 25-degree differential between supply and return, and that is too high. Apparently it's supposed to be around 20 or less. He thinks some additional airflow capacity will help this.

    Low ir flow, so there is part of your freeze up problem.

    His next suggestion is to add some additional ductwork to the master bedroom (the hot room on front of the house over the garage). He said although our ductwork is properly sized as a system, it's not distributing cooling well for where it's actually needed. Since we often end up freezing out the rest of the house to get the master comfortable, I think he is hoping that additional CFS in the master will:
    If your duck system is properly sized, you wouldn't have a high temp delta. Unless there was an air flow restriction in it from blocked registers or duct liner coming loose.

    Guessing they haven't checked static pressure of the duct system yet.
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  3. #16
    Join Date
    May 2008
    Location
    Missouri
    Posts
    3,504
    I'd agree with Mark, add the freeze protection thermostat and then work on getting the proper amount of air flow. You'll always need a "freeze stat" once you regularly set the thermostat below 70 degrees to eliminate nuisance freeze ups.

  4. #17
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Quote Originally Posted by HVACGUY89 View Post
    RULE OF THUMB IS 400SQ FT. PER TON.
    More like a rule of DUMB...
    If more government is the answer, then it's a really stupid question.

  5. #18
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,913
    HVACGUY89, this is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise here. Please apply to the AOPC today, thank you.

    You can find the rules for posting and qualifications here.


    Further infractions may result in loss of posting privileges.
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  6. #19
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,913
    Quote Originally Posted by mark beiser View Post
    More like a rule of DUMB...
    I have 1650 sq ft, 2.5 tons of A/C and I'm over sized(A/C was here before me). I can maintain 72 inside when its 98 outside. So much for that 400 sq ft per ton rule.
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